.box {
    width: 400px;
    height: 200px;
    border: 1px solid;
    border-radius: 8px;
}

.item {
    width: 80px;
    height: 80px;
    border: 1px solid;
    border-radius: 8px;
    text-align: center;
    line-height: 80px;
}

.left {
    float: left;
}

.danger {
    border: #FF0000 1px solid;
}